Inhaled corticosteroid use and asthma hospitalization rates in Japan

Area of Science:

• Epidemiology
• Pulmonology
• Pharmacology

Background:

• Asthma remains a significant public health concern globally.
• Understanding the impact of anti-inflammatory medications on asthma hospitalization rates is crucial for effective disease management.
• Previous research has explored various asthma treatments, but long-term epidemiological data on specific drug classes in diverse populations is still developing.

Purpose of the Study:

• To investigate the association between anti-inflammatory drug use, specifically inhaled corticosteroids, and asthma hospitalization rates in Japan.
• To analyze trends in asthma hospitalizations across different age groups during a defined period.
• To evaluate the potential role of anti-inflammatory medications in reducing asthma-related hospital admissions.

Main Methods:

• An epidemiological study design was employed, analyzing data from 1990 to 2002 in Japan.
• Asthma hospitalization rates were derived from national governmental surveys of in-patients.
• Data on anti-inflammatory drug prescriptions, including inhaled corticosteroids and leukotriene receptor antagonists, were obtained from the IMS prescription database.
• Patients were categorized into four age strata: ≤4 years, 5–19 years, 20–39 years, and 40–64 years.

Main Results:

• A significant increase in annual prescriptions for inhaled corticosteroids was observed throughout the study period.
• Asthma hospitalization rates generally decreased across all analyzed age groups, with the exception of the ≤4 years cohort.
• Concurrent increases in the utilization of leukotriene receptor antagonists were noted across all age demographics.

Conclusions:

• The findings suggest that the increased use of anti-inflammatory drugs, notably inhaled corticosteroids, may have contributed to the observed decline in asthma hospitalizations.
• Targeted interventions and increased use of inhaled corticosteroids in infants and very young children could potentially play a role in preventing hospitalizations within this vulnerable age group.
• Further research is warranted to elucidate the precise mechanisms and long-term effects of these medications on asthma exacerbations and healthcare utilization.